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authorKees Cook <keescook@chromium.org>2022-09-27 03:39:27 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2022-09-30 15:37:10 +0300
commit7cd04013fbf3e6dcb67ca6b59aa813269a2ad9ce (patch)
tree8596ba4c18a16f6335313ad70312fab33c94c362 /drivers/w1
parent9c573cdcf913e0a38bc260634017be3174595c56 (diff)
downloadlinux-7cd04013fbf3e6dcb67ca6b59aa813269a2ad9ce.tar.xz
w1: Split memcpy() of struct cn_msg flexible array
To work around a misbehavior of the compiler's ability to see into composite flexible array structs (as detailed in the coming memcpy() hardening series[1]), split the memcpy() of the header and the payload so no false positive run-time overflow warning will be generated. [1] https://lore.kernel.org/linux-hardening/20220901065914.1417829-2-keescook@chromium.org/ Cc: Evgeniy Polyakov <zbr@ioremap.net> Signed-off-by: Kees Cook <keescook@chromium.org> Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org> Link: https://lore.kernel.org/r/20220927003927.1942170-1-keescook@chromium.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/w1')
-rw-r--r--drivers/w1/w1_netlink.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/w1/w1_netlink.c b/drivers/w1/w1_netlink.c
index fa490aa4407c..db110cc442b1 100644
--- a/drivers/w1/w1_netlink.c
+++ b/drivers/w1/w1_netlink.c
@@ -611,7 +611,8 @@ static void w1_cn_callback(struct cn_msg *cn, struct netlink_skb_parms *nsp)
}
atomic_set(&block->refcnt, 1);
block->portid = nsp->portid;
- memcpy(&block->request_cn, cn, sizeof(*cn) + cn->len);
+ block->request_cn = *cn;
+ memcpy(block->request_cn.data, cn->data, cn->len);
node = (struct w1_cb_node *)(block->request_cn.data + cn->len);
/* Sneeky, when not bundling, reply_size is the allocated space